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var $ = require('../internals/export');
var getBuiltIn = require('../internals/get-built-in');
var apply = require('../internals/function-apply');
var call = require('../internals/function-call');
var uncurryThis = require('../internals/function-uncurry-this');
var fails = require('../internals/fails');
var isArray = require('../internals/is-array');
var isCallable = require('../internals/is-callable');
var isObject = require('../internals/is-object');
var isSymbol = require('../internals/is-symbol');
var arraySlice = require('../internals/array-slice');
var NATIVE_SYMBOL = require('../internals/native-symbol');
var $stringify = getBuiltIn('JSON', 'stringify');
var exec = uncurryThis(/./.exec);
var charAt = uncurryThis(''.charAt);
var charCodeAt = uncurryThis(''.charCodeAt);
var replace = uncurryThis(''.replace);
var numberToString = uncurryThis(1.0.toString);
var tester = /[\uD800-\uDFFF]/g;
var low = /^[\uD800-\uDBFF]$/;
var hi = /^[\uDC00-\uDFFF]$/;
var WRONG_SYMBOLS_CONVERSION = !NATIVE_SYMBOL || fails(function () {
var symbol = getBuiltIn('Symbol')();
// MS Edge converts symbol values to JSON as {}
return $stringify([symbol]) != '[null]'
// WebKit converts symbol values to JSON as null
|| $stringify({ a: symbol }) != '{}'
// V8 throws on boxed symbols
|| $stringify(Object(symbol)) != '{}';
});
// https://github.com/tc39/proposal-well-formed-stringify
var ILL_FORMED_UNICODE = fails(function () {
return $stringify('\uDF06\uD834') !== '"\\udf06\\ud834"'
|| $stringify('\uDEAD') !== '"\\udead"';
});
var stringifyWithSymbolsFix = function (it, replacer) {
var args = arraySlice(arguments);
var $replacer = replacer;
if (!isObject(replacer) && it === undefined || isSymbol(it)) return; // IE8 returns string on undefined
if (!isArray(replacer)) replacer = function (key, value) {
if (isCallable($replacer)) value = call($replacer, this, key, value);
if (!isSymbol(value)) return value;
};
args[1] = replacer;
return apply($stringify, null, args);
};
var fixIllFormed = function (match, offset, string) {
var prev = charAt(string, offset - 1);
var next = charAt(string, offset + 1);
if ((exec(low, match) && !exec(hi, next)) || (exec(hi, match) && !exec(low, prev))) {
return '\\u' + numberToString(charCodeAt(match, 0), 16);
} return match;
};
if ($stringify) {
// `JSON.stringify` method
// https://tc39.es/ecma262/#sec-json.stringify
$({ target: 'JSON', stat: true, arity: 3, forced: WRONG_SYMBOLS_CONVERSION || ILL_FORMED_UNICODE }, {
// eslint-disable-next-line no-unused-vars -- required for `.length`
stringify: function stringify(it, replacer, space) {
var args = arraySlice(arguments);
var result = apply(WRONG_SYMBOLS_CONVERSION ? stringifyWithSymbolsFix : $stringify, null, args);
return ILL_FORMED_UNICODE && typeof result == 'string' ? replace(result, tester, fixIllFormed) : result;
}
});
}